Data

Contains the apMatch token, followed by an AttrParse token.

apMatch. Contains the token to match to determine
whether the optional section is present. apMatch is a subtoken
that can be used only within the opt token. apMatch token
always contains the flag token as a subtoken.

AttrParse. Specifies how to parse the optional part
of the screen. This version of the AttrParse element does not use the name
argument. It can contain any other token.